Question: What astronomical filter has color index 0.23 for Alpha Centauri?
Paraphrase: Regarding the color index 0.23 Alpha Centauri, what is the proper astronomical filter?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q12176 p:P1458 ?s . ?s ps:P1458 ?x filter(contains(?x , '0.23')) . ?s pq:P1227 ?value}